Fast optimisation of tidal stream turbine positions for power generation in small arrays with low blockage based on superposition of self-similar far-wake velocity deficit profiles
Fast optimisation of tidal stream turbine positions for power generation in small arrays with low blockage based on superposition of self-similar far-wake velocity deficit profiles
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DOI：
10.1016/j.renene.2016.02.019
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发表时间：
2016-07
期刊：
影响因子：
8.7
通讯作者：
P. Stansby;T. Stallard
中科院分区：
文献类型：
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作者：
P. Stansby;T. Stallard
先前已在实验室测量了单水平轴三叶片涡轮机在浅流中的远尾流速度，并显示出具有自相似的速度赤字剖面。还测量了具有一、二和三横向排的涡轮机阵列的尾流速度，并且简单地叠加单个涡轮机的速度不足可以准确预测组合尾流宽度和速度不足，通过体积通量守恒解释下游可变阻塞。阵列效率定义为产生的总功率与相同涡轮机单独产生的功率之比。从规定的初始涡轮机位置（通常凭直觉或根据实际考虑确定），使用链式法则调整涡轮机位置以增加每个涡轮机的功率，表明 3-4 个转子直径的相对较小的移动可以将阵列效率提高到 90% 以上。
Far wake velocities of a single horizontal axis three-bladed turbine in shallow flow have been measured previously in the laboratory and shown to have self-similar velocity deficit profiles. Wake velocities of arrays of turbines with one, two and three transverse rows have also been measured and simply superimposing the velocity deficits for a single turbine is shown to give accurate prediction of combined wake width and velocity deficit, accounting for variable downstream blockage through volume flux conservation. Array efficiency is defined as the ratio of total power generated to what would be generated by the same turbines in isolation. From prescribed initial turbine positions, generally determined intuitively or by practical considerations, adjusting the turbine positions to increase the power from each turbine, using the chain rule, shows that relatively small movements of 3–4 rotor diameters may increase array efficiency to over 90%.